JPS5863407A - Belt type molding device - Google Patents

Abstract

PURPOSE:To obtain the titled device that can heat and mold while giving surface pessure by continuous operation and improve heating efficiency by a method wherein a pneumatic pressure device is provided on the butting surface between two belts and air pressure is given from the back of the two belts. CONSTITUTION:A pneumatic pressure device 3 is provided on the butting surface between a lower belt 1 and an upper one 2, that is, on both back sides of the lower belt 1 and the upper one and they are joined with a communicating pipe. The pressure of the pressure device 3 is equal on the upper belt side and the lower belt sie, the same surface pressure is given to the lower and upper belts and the uniform surface pressure can be applied on both surfaces of a molded article 6. By such a method, the density of a heated article is increased and the heat condutivity is also improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a belt-type molding device that heats while continuously applying pressure between two belts.

When forming fibers and binders, plastic products, etc. into a sheet by applying pressure and heating, (α) Heat and pressurize the material by sandwiching it between two flat plates.

(b) Sandwich the belt between two belts, pressurize it with the belt, send it to the heating section, stop the belt, and heat and pressurize both belts with a flat plate provided on the back of the belt.

(C) It is sandwiched between two belts, and pressure is applied by sandwiching it between two rolls and using roll linear pressure. In this case, methods such as heating from the back side of the belt are widely known.

However, in the case of (→), the operation is a batch system, which is inefficient, and in the case of (b), although it is better than (α), it is basically a batch operation, which is inefficient. In case (C), the pressure is applied by linear pressure using rolls, and if it is desired to apply surface pressure, it is impossible because the rolls are circular.

The present invention was proposed in order to solve the above-mentioned conventional drawbacks, and the object to be formed is sandwiched between two belts, and a pneumatic chamber is provided on the back surfaces of the two belts to apply pneumatic pressure to the back surfaces of the belts. By compressing the belt and heating it from the back side of the belt with a heating unit installed in the pneumatic chamber, the pressing force acting on the back side of the belt becomes ideal surface pressure, and the efficiency is improved due to continuous operation.
Moreover, compression molding improves the density and heat transfer rate of the workpiece,
It is an object of the present invention to provide a belt-type molding device that can improve heating efficiency.

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 8 show a belt type pressurizing device showing an embodiment of the present invention. In the figure, (1) is lower bell), +2) is upper bell),
(3) is a pneumatic pressurizing device, (4) is a heating unit, (5
) is the air seal, (6) is the object to be formed, aα) (7 is the drum for the upper belt, (8α) (8b) is the drum for the lower belt, (9) is the communicating pipe, aO) is the air hole, αυ is Seal mounting grooves (one shows the pressurized air supply port to the pneumatic pressurization device (3).

In addition, the lower belt (1) is moved by the drum (8→(8h)).
The upper belt (2) is driven under tension by the drum (7α) (1). Note that there are many techniques widely known in the industry for driving and tensioning the belt, and a detailed explanation thereof will be omitted. Moreover, by being tensioned, the belts (1) and (2) form a uniform plane and have the effect of being bent apart.

Now, the pneumatic pressurizing device (3) is installed on the mating surface of the lower belt (1) and the upper belt (2), and is also installed on both back sides of the lower belt (1) and the upper belt (2) as shown in Figure 2. , are connected by a communicating pipe (9). In addition, the pressure of the pressurizing device (3) is applied to the upper and lower belts several times by the communication pipe (9), and ideal surface pressure is applied to the upper and lower belts at the same pressure, uniformly applying it to the molded object (6). It is possible to apply surface pressure.

Compressed air C to the pressurizing device (3) is supplied from the supply port a21. Note that since the compressed air production equipment is well known, a description thereof will be omitted. The heating unit (4) is installed inside the pressurizing device (3) and heats the upper and lower bells l)+2> from the back side using radiant heat. For this reason, the belt is heated under pressure while being continuously operated.

Alternatively, hot air or cold air can be used as pressurizing air to heat or cool the air.

The air seal (5) is slidably attached by providing grooves 01 on the four sides of the belt-side end surface of the pressurizing device (3), as shown in FIG. 8 showing the details of section B in FIG. Groove (11) is air hole 00
) communicates with the internal pressure of the pressurizing device (3) and presses the air seal (5) against the belt surface to improve the sealing effect. In addition, the molded object (6) is fed from one of the upper and lower bells [1 and 2], is sandwiched between the upper and lower bells (l/ ) m (2), and is continuously fed to the other end while being pressurized and heated. more excreted.

As explained in detail above, the present invention is equipped with a pneumatic pressurizing device, so that conventional molding devices that pressurize and heat a molded product by sandwiching it between two belts can be applied with intermittent surface pressure. Or, instead of applying linear pressure during continuous operation, it is now possible to heat-form while applying surface pressure during continuous operation. Therefore, since the heating belt performs compression at the same time as heating, the density of the object to be heated increases, and as a result, the heat transfer rate increases by h, so that the heating device can be made compact. Note that if an air seal is provided between the belt and the pneumatic pressure device, the air seal is automatically pressurized by air pressure and pressed against the belt. Therefore, even if there is a change in the thickness of the molded object or wear of the air seal, there is no need to adjust the upper-lower distance of the pressurizing device.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a belt type forming apparatus showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 8 is a detailed view of section B in FIG. 2. Description of the main parts of the diagram

Claims (1)

[Claims] In a molding device that sandwiches the object to be molded between two belts, applies pressure, and heats it, a pneumatic pressurizer is installed on the mating surface of the two belts, and air pressure is applied from the back side of the two belts. A belt-type forming device characterized by being able to operate continuously while applying surface pressure.